A battery isolator is a device designed to allow the vehicle alternator to charge an auxiliary battery whilst the vehicle is running, and to isolate the starter battery from the auxiliary battery when the vehicle is not running. This allows the operator to charge the auxiliary battery when the vehicle is running and run loads from the auxiliary battery whilst the vehicle is off without the risk of discharging the start battery to a point where it is not able to start the vehicle. Modern battery isolators will do this without any input from the vehicle operator.
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